Silicon Photonics FMCW LiDAR Chip With a Slow-Light Grating Beam Scanner

Baba, Toshihiko; Tamanuki, Takemasa; Ito, Hiroyuki; Kamata, Mikiya; Tetsuya, Ryo; Suyama, Saneyuki; Abe, Hiroshi; Kurahashi, Ryo

doi:10.1109/jstqe.2022.3157824

Cited by 40 publications

(11 citation statements)

References 26 publications

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“…The upward directionality of the antenna in the wavelength interval from 1.4 μm to 1.9 μm is given in Fig. (2). It can be seen that the upward directionality of the antenna is greater than 60% in the wavelength range of 1413 nm to 1875 nm.…”

Section: Simulationmentioning

confidence: 94%

“…Benefiting from the rapid development of photonic integrated circuits, OPA is a recent research hotspot in several fields, including light detection and ranging (LiDAR) 1,2 , free-space optical communication 3 , laser imaging 4 and biosensors 5 . However, due to the lack of sufficient vertical asymmetry in the design, most current OPA antennas radiate almost identically in the upward and downward directions, which lead to a set of interference fringes in the elemental factor of the antenna 6 .…”

Section: Introductionmentioning

confidence: 99%

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Highly directional Si antenna based on dual-layer gratings for optical phased array

Liao²,

Wang

et al. 2023

Nanophotonics, Micro/Nano Optics, and Plasmonics VIII

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Optical phased array has great potential in the fields of light detection and ranging, free-space optical communication, laser imaging and biosensors due to their excellent characteristics such as all-solid-state structure, fast scanning speed, good stability, high resolution and low cost. According to the radar equation, the transmit power will directly determine the maximum ranging distance of optical phased arrays. Limited by nonlinear effects and damage threshold, it is difficult to further increase the input optical power of Si-based OPA above 30 dB. Therefore, fully utilizing the input optical power of OPA is an important issue in the research. In this paper, we demonstrate a novel three-layer silicon antenna for OPA, which consists of a upside grating layer, a waveguide layer and a downside grating layer from top to bottom. In the simulation, we found that the upward directivity of the antenna is greater than 60% in a large wavelength range of 1413 nm to 1875 nm. In addition, the maximum upward directivity of the antenna is 94.68% at 1599nm. The above result is beneficial to increase the output power of the phased array and eliminate the blind area in the field of view when the beam is scanned to the point of destructive interference. Overall, the above results show that the design proposed in this paper has great potential for application.

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Section: Simulationmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Highly directional Si antenna based on dual-layer gratings for optical phased array

Liao²,

Wang

et al. 2023

Nanophotonics, Micro/Nano Optics, and Plasmonics VIII

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“…The practical advantage of this nature of the SOA-RTF laser is that no additional laser-frequency control algorithm, such as dynamic control of phase-tuning or dummy injection-current into a laser chip, is needed for wavelength drift compensation. In addition to optical communications use, the low frequency error with SOA shuttering is also suitable for remote sensing systems using a laser frequency such as coherent LiDAR [40,41].…”

Section: A Transient Response Of Laser Frequencymentioning

confidence: 99%

Hitless Wavelength Switching of Semiconductor Optical Amplifier-integrated Reflection-type Transversal Filter Laser with Suppressed Frequency Error

Ueda

Saito

Shindo

et al. 2023

J. Lightwave Technol.

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A spurious wavelength (spurious) from a tunable laser during tuning is an issue in optical systems based on dynamically controlled laser wavelengths. Output shuttering synchronized with tunable-laser tuning is promising way to suppress spurious. A semiconductor optical amplifier (SOA) is an ideal shutter for laser outputs with spurious in terms of lowwavelength-independent extinction ratio. We developed an electro-optically tunable reflection-type transversal filter (RTF) laser monolithically integrated with an SOA. Thanks to the nanosecond scale tuning speed of the RTF laser, the required shuttering time of the integrated SOA is also a corresponding nanosecond scale, which leads to little temperature change in the laser cavity. As a result, the laser frequency drift after turning off/on the SOA is suppressed to within +/-2.5 GHz without any additional laser control algorithm to compensate for the thermal crosstalk from the SOA. Using the laser, we demonstrated a "hitless" wavelength-switching subsystem based on a coherent format. Namely, outputs from an SOA-RTF laser coded with 32-GBd dual-polarization quadrature phase-shift keying (128 Gbps) are dynamically switched with spurious eliminated by SOA shuttering. In addition to practical bit error rates (BERs) of wavelength channels from the SOA-RTF laser, we observe no interference with the BER of a wavelength channel from another monitor laser in the wavelength-switching subsystem.

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“…220nm and 3 microns SOI waveguide platforms are the main technologies used in silicon photonics, and various components of the LiDAR system on the chip based on the 220nm SOI platform have been presented [6][7][8][9] due to its open resource and easy access. They have already demonstrated the capabilities of detecting moving targets and solid-state beam control, among others.…”

Section: Introductionmentioning

confidence: 99%

FMCW LiDAR based on integrated coherent receiver chip

Xu,

Liu,

Wang

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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Silicon photonics enables large-scale integration of Frequency Modulated Continuous Wave (FMCW) Light Detection and Ranging (LiDAR) system on silicon on insulator (SOI) substrate. In this paper, we set up an FMCW LiDAR system for a chip-scale coherent receiver chip based on a 3 µm SOI platform which has the advantages of low waveguide loss and high process tolerance. An iterative learning pre-distortion method is used for linear frequency sweep. With the home-built FMCW LiDAR system, we have achieved a detection range of 160 m with an accuracy of 0.3 m which pave the way for miniaturized LiDAR used for autonomous driving.

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Silicon Photonics FMCW LiDAR Chip With a Slow-Light Grating Beam Scanner

Cited by 40 publications

References 26 publications

Highly directional Si antenna based on dual-layer gratings for optical phased array

Highly directional Si antenna based on dual-layer gratings for optical phased array

Hitless Wavelength Switching of Semiconductor Optical Amplifier-integrated Reflection-type Transversal Filter Laser with Suppressed Frequency Error

FMCW LiDAR based on integrated coherent receiver chip

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